This device looks fantastic! OMG my brain goes really fast when thinking about improvements on the M3W too! The Morgan cap is quite large and empty inside. The cap is just retained by pressure towards the inner part, so it doesn't move. That might be the Only problem: you can't push on something that's fixed!
BUT!!! the way the cap is fixed by pressure relies a lot on a round gasket / rubber. If you remove it, the outer cap may slide over the inner part… I'm starting to drool…
I tried but can't find the exact size of the round button of the device you put in your post. Do you have more Information about its real dimensions, Stephen?
